Template:Are You Sure/April 11

• ... that clockmaker Jean-André Lepaute (23 November 1720 – 11 April 1789) introduced numerous improvements in clockmaking, notably his pin-wheel escapement, and his clockworks in which the gears are all in the horizontal plane?

• ... that physicist and academic Macedonio Melloni (11 April 1798 – 11 August 1854) demonstrated that radiant heat has physical properties similar to those of light?

• ... that physicist and academic Ukichiro Nakaya (4 July 1900 – 11 April 1962) contributed to glaciology and low-temperature sciences, and that Nakaya created the first artificial snowflakes?